A cobpobation



May 26, 1931. BRlTTEN, JR 1,807,192

ATTACHMENT FOR CALCULATING MACHINES Filed Aug. 15. 1929 s Sheets-Sheet 1 0 0 0 0 0 0 0 0 0 0 I 0 ...=Lx N 0 06:; 0 0 0000000000 8 h 0 N 0000000000 0 0000000000 0 0 0000000000 &10 0 +0000000000 w b 0 :2 I 0000000000 7 0 x0 & 0000000000 :3 0 0w+40000000000 Q Q Q fl MECCA W INVENTOR.

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AA ATTORNEY May 26, 1931.

E. F. BRITTEN, JR

ATTACHMENT FOR CALCULATING MACHINES Filed Aug. 15, 1929 3 Sheets-Sheet 2 INVENTOR.

W 5? 3% By 4 ATTORNEY.

May 26, 1931. E. F. BRITTEN, JR 1,807,192

ATTACHMENT FOR CALCULATING mcmuss Filed Aug. 15. 1929 5 Sheets-Sheet 3 E2303- (5 JEGD- 3. J

INVEN TOR.

6 ATTORNEY.

Patented May 26, 1931 g UNITED STATES PATENT OFFICE EDWIN F. BRITTEN, JR., OF MAPLEWOOD, NEW JERSEY, ASSIGNOR TO MONROE CAL- CULATING MACHINE COMPANY, OF ORANGE, NEW JERSEY, A CORPORATION OF DELAWARE ATTACHMENT FOR CALCULATING MACHINES Application filed August 15, 1929. Serial No. 388,050.

This invention relates to calculating machines, and particularly to calculating machines having transversely and vertically movable carriages.

The principal object is to put a tension on the carriage moving element so as to insure smooth and substantially noiseless shifting of the carriage.

Another object is to produce a device of 1 this nature automatically called into action when the machine is set for full automatic division.

Another object is to produce a device of this nature which may e slightly modified so as to place a constant tension on the carriage moving member.

Another object is to provide a device of this nature with means whereby the tension may be increased and decreased so as to compensate for the weight of different styles of carriage.

With these and other objects in view wh ch will become apparent as the specification proceeds, the invention resides in certain novel construction and combination and arrangement of parts, the essential features of which are shown in the accompanying drawin in which:

Fig. 1 is a top plan view of a calculating machine provided with my improvement.

Fig. 2 is a vertical sectlonal view taken substantially on line 2-2 of F g. 1. V

Fig. 3 is a detail top plan v ew of the essential elements of the invention per se 1n ineffective position.

Fig. 4 1s a similar view showing the parts in efifective position.

Fig. 5 is a detail vertical sectional view on line 5-5 of Fig. 3.

Figs. 6 and 7 are detail sectional views on lines 6-6 and 7-7 of Fig. 1.

Figs. 8 and 9 are enlarged detail horizontal sections taken immediately above the eccentric portion of the pivot pin and indicating respectively the lowest and highest tension positions of the eccentric.

Like characters of reference refer to like parts in all views.

Referring to the drawings in detail, 10 represents the casing and 11 the framework of a calculating machine. By way of illustrating the application of my invention, I have chosen to show the same as incorporated in a calculating machine of the well-known Monroe construction, although this is to be considered as merely illustrative, the invention being applicable to machines of various types. The controlling, actuating and clearing mechanism for the Monroe type of machine is fully set forth in the U. S. patent to G. C. Chase No. 1,566,650, and the pending application of E. F. Britten, Jr. Ser. No. 337,073, filed Feb. 2, 1929, and disclosures therein referred to, to all of which reference may be had for a complete disclosure of such mechanism.

The keyboard frame is shown at'12 and guides a plurality of manipulative members as follows: digit setting keys 13, zero keys 14, keyboard clearing key 15, repeat key 16, non-repeat key 17, add operating key or plus bar 18, subtract operating key or minus bar 19, division lever 20, counter rotation-reversing shift lever 21, and multiplying keys 22. A driving motor is shown at 23, a hand operating crank at 24, and a carriage at 25. The carriage 25 carries a plurality of accumulators 26 and two sets of counters indicated at 27 and 28, the counters 27 being of the nineteen point type (having no carrying mechanism and each bearing the nine significant digits running in reverse directions from a common zero, one set of significant digits being colored differently from the other), and the counters 28 being of the usual ten-point type with carry mechanism.

The direction of rotation of the accumulators and counters 26, 27, and 28 is controlled by the manipulative members 18, 19, 20 and 21, the latter serving merely to reverse driv ing ofthe counters and not of the accumulators.

Briefly, amounts set up in the digit setting keys 13, and thereby on differential actuating gears 29 (Fig. 2) are registered upon the differential registration wheels or accumulators 26 by the operation of differential gear shaft 30 and of shaft 31 whereon the tenscarry members are mounted, these shafts being connected by 11 ratio gears and'elliptia rotation of one di it space of one counter of each of the sets 2 and. 28, the denomina-.

tional counter operated being controlled by the position of the carriage. o

As described in said application rotation of a clearing handle indicated herein at 32 may be utilized to clear either the accumulators or counters. If the handle 32 is turned in a clockwise direction as viewed from the right hand side of the machine it will efiectthe clearing of the counters 27 and 28, while rotation of the handle 32 in a counter-clockwise direction as viewed from the right-hand side of the machine will effect clearing of the ar cumulators 26.

' The carriage is movable horizontally by means of a handle 33 mounted on the front end of a shaft 34 running from front to rear of the keyboard 12. Shaft 34 carries a cross member 35 having rollers 36 adapted to engage teeth on the carriage so as to raise the carriage, shift it horizontally, and control the dropping back of the carriage, as is well known in the art. The shaft '34 may also be operable automatically during division,

by means already well known and on the market. During such, automatic shifting, the shaft is given a quick impulse and. consequently the carriage comesto its new positionwith considerable noise and jar. The present. invention contemplates minimizing of such noise and jar.

. Pinned or otherwise securedto-shaft 34 is a collar 37 which rotates with the shaft. The

keyboard 12 is cut away to permit a portion of collar 37 toextend therethrough. In rear of collar37 is a friction disk 38 which also extends thru the keyboard, but which is free on shaft 34 and prevented vfrom turning therewith by fingers 39 of the keyboard 12 extending into notches 40 of disk 38. Coiled about shaft 34 in rear of disk 38 is a tenison s ring41 which is of somewhat larger inside iameter than the outside diameter of shaft 34, so that the spring is free on'the shaft. A

disk 42 is free on shaft 34 in rear of spring 41.

' A lever 43 of L-shaped formation is formed with a pair of fingers 44 and 45, the finger 45 being riveted to the lever proper at 46. These fingers are bent so as to embrace shaft 34 inrear of washer or disk 42, fin er 441ccingabove the shaft and finger 45 slow the same. The fingers 44 and 45 have a slot 47 formed in them thru which an eccentric pivot 48v passes. The pin 48 .passes thru the in keyboard and its eccentric portion 49 forms the pivot for lever 43.- By turning pin 48 neomea' its eccentric portion 49 may be positioned forwise of the keyboard so-as to permit the necessary movement of the eccentric 49 without I efi'e'cting any cross-wise movement of lever 43.

An arm 50 of lever 43 extends forwardly at their left-hand portion of the keyboard and is formed with a notch 51 which embraces the division lever 20. The lever 43 is maintained in close relation to the under side of the keyboard by a headed pin or screw 52, the shank of which passes thru a slot 53 in arm 50 and is secured in the keyboard frame 12.

It is now apparent that when the division lever 20 is moved into its rearmost or efiective position, the lever 43 will be rotated clockwise as viewed from the top, thereby causing fingers 44 and 45 to move washer 42 forwardly on shaft 34 and thereby tensioning spring 41 according to the position of eccentric 49. Tensioni'ng of spring'41 caums friction disk 38 to bear against collar37, thereby causing the carriage to be retarded in its dropping movement just suficiently to eliminate the 100 'efiective or .tensioning position. In such a machine, the tension is always operative whether the carriage is moved from one de-' nominational position to another automatically or by hand. While I have described what I consider to be the most desirable emodiment of my invention, it is obvious that many changes could be made without departing from the spirit of my invention, and I, therefore, do not limit myself:-'to the exact construction shown, or to anythingless than the whole of my invention as hereinbefore described, and as hereinafter claimed.

4 claim: 1. In a calculating machine, the combination of calculating mechanism, a transverse- 1y movable carriage, means for moving said carria transversely, a tension device cooperative with said carriage'moving means 180 20 a device for controllin' the direction of'drive and adapted to retard operation thereof, and means for automatically rendering said tension device effective and ineffective.

2. ha calculating machine, the combina tion of a carriage,'accumulators mounted on. said carriage, means for actuating said accumulators, a controlling device for controlling the character of computation performed .by said actuators and accumulators, means for shifting said carriage from one denominational position to another, and means controlled by said device resistance for applying to said carriage shifting means for minimizing the noise and jar incident to the shifting of said carriage.

3. In a calculating machine, the combination of a carriage, accumulators mounted on said carriage, actuating means for drivin said accumulators in either'direction at wil of said accumulators y said means, means for shifting said carriage fromlone denominational position to another, and meanscontrolled by said. device for automatically applying resistance to said carriage shifting means during rotation of said accumulators in one directlon.

4. In a calculating machine, the combination of a carriage, accumulators mounted on 80 said carriage, controlling means associated with said accumulators for performing division, means for shifting said carriage from one denomination to another, and means forautomatically applyinga brake to said car- 86 riage shifting means when the said controlling means is efi'ective.

5. The combination of a carriage, accumulators on said carriage, a shaft operable to effect shifting of said carriage from one de- 40 nominational position to another, brakin means for said shaft, actuating means for said accumulators, and a manipulative meinber operable to control operation of said accumulators b said actuating means and to simultaneous y render said braking means efiective.

6. The combination of a carriage, accumulators mounted on said carria e, actuating means for said accumulators, a s aft operable to move said carriage" from one denominationalposition to another, a braking device associated with said shaft, a lever for o rating said braking device, and a. manipu iztive element in engagement with said lever and operable for; controlling the character of computation tobe performed b said accumulators and actuating means and concomitant- 1y operating said lever to effect braking action of said device. v

In testimon whereofI afiix m rsi ature,

DWIN. F. BRlTdE j JR.

CERTIFICATE or CORRECTION.

Patent No. 1,807,192. ,Granted May 26, 1931, w

EDWIN F. BRITTEN, JR.

It is hereby certified that error appears in the printed specification of thev above numbered patent requiring correction as follows: Page 2, line 82, for "their" read the; page 3, line 12, claim 2, for "resistance for applying" read lor applying resistance; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the-case. in the Patent Oitice. v

' Signed and sealed this 7th day of July, A. D. 1931;

- M. J. Moore, (Seal) Acting Commissioner of Patents. 

